SSR: Restricting Access to Specific Pages Based on Authenticated User

Preliminary Checks

• This issue is not a duplicate. Before opening a new issue, please search existing issues: https://github.com/gatsbyjs/gatsby/issues
• This issue is not a question, feature request, RFC, or anything other than a bug report. Please post those things in GitHub Discussions: https://github.com/gatsbyjs/gatsby/discussions

Summary

@KyleAMathews asked for this issue: https://github.com/gatsbyjs/gatsby/issues/1100#issuecomment-1221020314

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A guide about how to perform simple authentication and authorization in Server-Side Rendering (SSR) using getServerData would be great!

I would suggest that it include the following:

1. A page and related static images that are fully public (no authentication required) - eg. a login page
2. A page and related static images that are accessible only to any logged-in user - eg. an index page
3. A page and related static images that are accessible only to any admin user - eg. an admin dashboard page

Further background information / motivation:

• https://github.com/gatsbyjs/gatsby/issues/1100#issuecomment-576655633
• https://github.com/gatsbyjs/gatsby/discussions/32479

Steps to Resolve this Issue

1. Look for a guide for authentication / authorization for SSR in the Gatsby docs
2. Fail in finding such a guide